docs: def get_relativelinenumbertable(self):
          """
          a sequence of (code_offset, line_number) pairs. Similar to the
          get_linenumbertable method, but the line numbers start at 0
          (they are relative to the method, not to the class file)
          """
  
          lnt = self.get_linenumbertable()
          if lnt:
              lineoff = lnt[0][1]
              return tuple((o, l - lineoff) for (o, l) in lnt)
          else:
              return tuple()